more than 500 students were forced to evacuate while police and the fbi worked to remove the explosives. >>> coming up next, the high-court showdown over arizona's voter i.d. law. what it could mean for elections across the country. >>> after a week of digesting the red meat, how will republicans move forward. send me your thoughts on facebook and twitter at mitchellreports. [ kitt ] you know what's impressive? a talking car. but i'll tell you what impresses me. a talking train. this ge locomotive can tell you exactly where it is, what it's carrying, while using less fuel. delivering whatever the world needs, when it needs it. ♪ after all, what's the point of talking if you don't have something important to say? ♪ [ female announcer ] from meeting customer needs... to meeting patient needs... ♪ wireless is limitless. [ female announcer ] from finding the best way... ♪ to finding the best catch... ♪ wireless is limitless. >>> today the supreme court heard arguments in another pivotal voter i.d. case. voting rights groups in arizona have challenged the proposition 200, a law req